The PXL-500 Tiger II Controller Platform (sold Separately) The new PXL-500 Tiger II Controller platform has taken Keri's acclaimed proximity-based access control system to the next level. Strong enough to manage a 256 door network at a single site or 256 doors per site at multiple sites, yet tame enough to handle a single door, the PXL-500 continues Keri's tradition of flexibility and expandability.